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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
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<A NAME="TaoLineSearchSetObjectiveRoutine"><H1>TaoLineSearchSetObjectiveRoutine</H1></A>
Sets the function evaluation routine for the line search
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petsctaolinesearch.h"
PetscErrorCode TaoLineSearchSetObjectiveRoutine(TaoLineSearch ls, PetscErrorCode(*func)(TaoLineSearch ls, Vec x, PetscReal*, void*), void *ctx)
</PRE>
Logically Collective on TaoLineSearch
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ls </B></TD><TD>- the TaoLineSearch context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>func </B></TD><TD>- the objective function evaluation routine
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- the (optional) user-defined context for private data
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Calling sequence of func</FONT></H3>
<pre>
func (TaoLinesearch ls, <A HREF="../Vec/Vec.html#Vec">Vec</A> x, <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> *f, void *ctx);
</pre>
<P>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>x </B></TD><TD>- input vector
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>f </B></TD><TD>- function value
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx (optional) user</B></TD><TD>- defined context
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Note</FONT></H3>
Use this routine only if you want the line search objective
evaluation routine to be different from the <A HREF="../Tao/Tao.html#Tao">Tao</A>'s objective
evaluation routine. If you use this routine you must also set
the line search gradient and/or function/gradient routine.
<P>
<H3><FONT COLOR="#CC3333">Note</FONT></H3>
Some algorithms (lcl, gpcg) set their own objective routine for the
line search, application programmers should be wary of overriding the
default objective routine.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../TaoLineSearch/TaoLineSearchCreate.html#TaoLineSearchCreate">TaoLineSearchCreate</A>(), <A HREF="../TaoLineSearch/TaoLineSearchSetGradientRoutine.html#TaoLineSearchSetGradientRoutine">TaoLineSearchSetGradientRoutine</A>(), <A HREF="../TaoLineSearch/TaoLineSearchSetObjectiveAndGradientRoutine.html#TaoLineSearchSetObjectiveAndGradientRoutine">TaoLineSearchSetObjectiveAndGradientRoutine</A>(), <A HREF="../TaoLineSearch/TaoLineSearchUseTaoRoutines.html#TaoLineSearchUseTaoRoutines">TaoLineSearchUseTaoRoutines</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/tao/linesearch/interface/taolinesearch.c.html#TaoLineSearchSetObjectiveRoutine">src/tao/linesearch/interface/taolinesearch.c</A>
<BR><A HREF="./index.html">Index of all TaoLineSearch routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
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